Cita APA (7a ed.)

Hall, H. S., & Knight, S. R. (1920). Elementary trigonometry (4th ed., rev. and enl.). MacMillan and Co.

Cita Chicago Style (17a ed.)

Hall, H. S., y S. R. Knight. Elementary Trigonometry. 4th ed., rev. and enl. London: MacMillan and Co, 1920.

Cita MLA (9a ed.)

Hall, H. S., y S. R. Knight. Elementary Trigonometry. 4th ed., rev. and enl. MacMillan and Co, 1920.